The invention relates to a technical device for producing the patency in artificial transverse structures 16 for the utilization of the energy drop height 7 on streams with the simultaneous conversion of the flow energy into electrical energy. Over several layers such as a porous traveling layer 3 and a porous development layer 18 so that the aquatic fauna 8 undamaged and freely motivated in both directions, the fish ecology hydrodynamic screw 20 walk through. However, these are shared by both the living and dead substances in the transporting media such as water. This creates a forced situation between electricity generation and freely motivated harmless migration of the aquatic fauna. 8. Backwashing the fish-ecological hydrodynamic screw 20 is necessary if necessary. With the generator 33 located inside the central tube, the flow of the blades 17 can be converted directly into electricity. However, further migration of aquatic fauna 8 through the fully lined migratory space for large and small individuals 4 and 5 requires further ethohydraulic research of all aquatic fauna species 8.
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